Connecting Win 7 x64 to a Samba share on Red Het

I have a situation that I don't quite understand. I have a new Windows 7 64-bit machine, and I am trying to re-connect to several Samba shares that I have defined. These still work fine when accessed from my old XP box.
However, i can only connect to the shares on Ubuntu now. The shares on Red Hat (an older distro, to be sure) do not allow me to connect; I am getting a 'wrong password' error. Apparently, something newer in the Ubuntu box is allowing the connection. How do I update the Red Hat machine (or loosen the Win 7 machine) to get this to work?
Thanks.

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